Low-water alarm.



PATENTED MAY 14, 1907 G. A. LEMEN. LOW WATER ALARM,

APPLICATION FILED JULY 22, 1905.

u In 0 Nu m 2 WV UNITED STATES PATENT OFFICE.

CLKRENOE ADELBERT LEMEN, OF DETROIT, MICHIGAN.

Low-WATER ALARM.

Specification of Letters Patent. Y

Fatented May 14, 1967.

Application filed July 22', 1905 Serial No. 270805.

, gan, have invented certain new and useful Improvements in Low WaterAlarms, of which the following is a specification described in such amanner that a person skilled in the art could manufacture the same.

This invention has reference to low water alarms and has for its objectan-alarm that shall be simple, useful and economical in construction andcertain in its 0 eration at different pressures of steam an consists inthe combination and arrangement of devices described and' specifiedherein, the description showing only one form in which. the device may.be operated.

In the drawings, Figure 1. is a perspective view with a portion of thewater acket tank broken awayto' show the interior and a cover ofthesameopen. Fig. 2. is a vertical section explaining theinterior-arrangements.

-. B is a steam pipe: B is the means [or connecting same to the boiler.

A is a tank or water jacket surrounding the steam pipe B.

A is a cover reventing evaporation of the water contained in the waterjacket.

C is a casting supporting the thermometer bulbr Q C is an insulatingmaterial facing the castin C. r

is the glass of the usual mercurial thermometer consisting of acapillary tube having its exhaustion of air approaching a vacuum.

D is the mercury contained within. the capillary tube.

E is the metal casing forming the prolongation of'the casting C andcontaining the bulbof the thermometer and the packing s'urrounding. v

g is the..bulb of the thermometer, where the capillary tube is enlargedto contain a reservoir ofmercury.

His a valve connected to the steam pipe B for the purpose of drawing oilits conteu' ts.

E and E are the several parts ol the stuffing box for the purpose ofretaining the bulb of the thermometer within the steam pipe B.

fis a seal for sealing the pacldn F within the casing E and surroundingthe t iermometer bulb g. v

gshows one of the wires connected with the binding post G at a pointwhere it is blown in the glass of the thermometer.

I In operation the thermometer is set for the pressure of steam underwhich it is intended to operate and at such a point on the boiler thatthe lowering of the water below the steam pipe B allows an inrush ofvapor which causes expansion of the mercury and the mercury therebyrising in the tube makes connection of the electrical circuit throu hthe upper wire blown in the glass .nd the binding post. This closing ofthe circuit cperates the signal device. The water jacket used with thesetting of the thermometer allows the operation under dillerentpressures of steam from the lowest pressure used up to the highest inpractical use. The mercury of the thermometer should be contained in atube havingan exhaustion of air as near a vacuum as possible.

Having described my invention, what I claim is:

1. In an electric low water alarm, the combination with a steam pipe, ofa support for a mercurial thermometer forming a casing for the bulb ofsame, wires blown in the glass of the rtherm ometer connected with anelectrical circuit so that the expansion of the mercury closes thecircuit, a signal device in said circuit operated thereby, and. a wateryjacket surrounding said steam pipe.

2. In an electric low water alarm, the combi'nation with a steam ii .esurrounded b a water jacket, of a support for a mercurial thermometerforming a casing for the bulb of same capable of being inserted intotliesaid steam plpe, wires blown in the glass 'of the, said thermometerconnected with an elec trical circuit, a signal device'in said circuitsaid circuit being closed, and a signal device metal connected. to thesaid steam pipe, a

6. In an electric lOW Water alarm the combination with a heater adaptedto contain steam, of a steam pipe extending from (he interior of theheater to the exterior. a water jacket surrounding the said steam pipeexterior to the said heater, a bulb of a mer curial thermometercontained in the steam pipe, Wires blown in the glass of the thermometerconnected with the electric circuit so that the expansion of the mercurycloses the circuit and operates a signal device thereby and a casingsurrounding the bulb oi I the said thermometer adapted to enter the lvater jacket surrounding the said steaml pipe, and asignal devicecontained in the said circuit and operated thereby.

4. In an electric low Water alarm, the combination with a steam pipeadapted to be i connected to the boiler, of a device for operating asignal device by expansion of the i metal consisting of or connected tothe said i steam pipe, a water jacket surrounding the said steam pipe,and a Valveor means of drawing off the contents of the said steam pipe5. in an electric low. Wate alarm the combination with a Water jacketedsteam pipe, of a bulb of a mercurial thermometer contained therein,Wires blown in the glass oi' the thermometer connected with the electriccircuit so that the expansion of the mercury closes the circuit andoperates a signal device steam pipe sufficiently to allow ol'surrounding of the'said casing by steam from the boiler as and for thepurposes specified.

In Witness whereof I have hereunto set my hand in presence of twowitnesses.

CLARENCE ADELBE 'l lil'iM liN.

thereby, and compressible material contained in the casing fitting int-0thesaid steam Vl/itnesses:

pipe and surrounding the bulb of the said ll/IAUDE Animis, thermometer.JNo. SALE.

